"Edit Page' works for any content type

* Product, catalog, etc.
* Edit Properties works for addressable content.
[BUG FIX] Clicking on link when viewing a block works

* iframe is now reset.
[BUG] Can't publish the block when viewing it (logs you out)

* Publish button works on blocks now.
* Consolidate js for getting CSRF tokens.
* Use rails core feature rather than injected js.
Can now delete pages when viewing them.
[BUG] Preview doesn't work on contentblock#index

When selecting a block in content library, it opens the preview window.
[BUG] Can't list versions when viewing block as page.

* Fix issue where non-addressable blocks shouldn't have preview button.
* Remove no longer used HTML code.
Need a way to get back to list of 'Products' 

* When working with a specific block, add a 'Back to Block Name(s)'